CN114132425B - Motor unit for bicycle derailleur - Google Patents

Abstract

A motor unit 14 for a bicycle derailleur 10 includes an output shaft 24 , a motor 26 , a drive gear 28 , an output gear 30 , an intermediate gear structure 32 and an angle sensor 34 . The motor 26 includes a motor shaft 36 . The drive gear 28 is on the motor shaft 36 of the motor 26 and the output gear 30 is on the output shaft 24 . An intermediate gear arrangement 32 is located in the load path between the drive gear 28 and the output gear 30 , and the intermediate gear arrangement 32 includes at least one reduction gear 38 and an encoder 40 . Angle sensor 34 is configured to detect rotation of encoder 40 . The rotation ratio between the encoder 40 and the output gear 30 is such that the encoder 40 rotates less than 360 degrees.

Description

Motor unit for bicycle derailleurs

Background technique

Many bicycles have chain drive transmission systems that include multiple front sprockets and multiple rear sprockets. The rider can increase or decrease the gear ratio of the transmission system with a shift operation, which moves the chain from one sprocket to the other through the derailleur. In electronic derailleur systems, the movement of the derailleur is controlled by the motor unit. To move the chain from one sprocket to the other, the motor unit determines which sprocket is currently engaged with the chain and the amount of movement required to reach the desired gear based on the position of the derailleur. In some cases, such as power outages, backlash or skipped gears, the motor unit may lose the information it needs to determine the position of the derailleur. Challenges exist in designing a motor unit for an electronic bicycle derailleur that can determine the derailleur position in the event of a power outage, backlash, or jump.

Contents of the invention

The present invention discloses a motor unit for a bicycle derailleur developed to solve the above-mentioned problems. According to a first aspect of the present invention, a motor unit for a bicycle derailleur includes an output shaft, a motor, a drive gear, an output gear, an intermediate gear structure, and an angle sensor. The motor includes a motor shaft. The drive gear is on the motor shaft of the motor. The output gear is on the output shaft. An intermediate gear arrangement is located in the load path between the drive gear and the output gear, and the intermediate gear arrangement includes at least one reduction gear and an encoder. An angle sensor is configured to detect rotation of the encoder. The ratio of rotation between the encoder and the output gear is such that the encoder rotates less than 360 degrees.

With a motor unit for a bicycle derailleur according to the first aspect, it is possible to provide a compact motor unit in which the output gear rotates through its full range while the encoder rotates less than 360 degrees, allowing the encoder to rotate at After a power outage was identified.

According to a second aspect of the present invention, the motor unit for a bicycle derailleur according to the first aspect is configured such that a rotatable range of the output gear is limited by a rotation limiting structure of the bicycle derailleur. With the motor unit for a bicycle derailleur according to the second aspect, it is possible to limit the rotatable range of the output gear to prevent the encoder from rotating beyond 360 degrees.

According to a third aspect of the present invention, the motor unit for a bicycle derailleur according to the second aspect is configured such that the main body of the bicycle derailleur and the motor unit are connected to a link of the bicycle derailleur, and the rotatable range is Limitations are mechanical. With the motor unit for a bicycle derailleur according to the third aspect, it is possible to rotate the link of the bicycle derailleur and limit the rotatable range in the event of power interruption.

According to a fourth aspect of the present invention, the motor unit for a bicycle derailleur according to the second aspect is configured such that the output gear contacts a housing of the motor unit, and limitation of a rotatable range of the output gear is electric. With the motor unit for a bicycle derailleur according to the fourth aspect, the limit of the rotatable range of the output gear can be adjusted electrically.

According to a fifth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to fourth aspects is configured such that the output gear is non-circular. With the motor unit for a bicycle derailleur according to the fifth aspect, it is possible to increase the efficiency of the motor unit and the battery life by transmitting the variable rotation ratio of the output gear.

According to a sixth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to fifth aspects is configured such that the output gear is a sector gear. With the motor unit for a bicycle derailleur according to the sixth aspect, the size and weight of the output gear can be reduced.

According to a seventh aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to sixth aspects is configured such that the rotational force of the output shaft is transmitted to the link of the bicycle derailleur. With the motor unit for a bicycle derailleur according to the seventh aspect, it is possible to move the link of the bicycle derailleur to move the chain to a desired sprocket.

According to an eighth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to seventh aspects is configured such that the bicycle derailleur includes a base member, a link mechanism, and a chain guide front bicycle derailleur. With the motor unit for a bicycle derailleur according to the eighth aspect, it is possible to determine the position of the front bicycle derailleur with respect to the plurality of front sprockets after interruption of power.

According to a ninth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to seventh aspects is configured such that the bicycle derailleur includes a base member, a movable member, a link mechanism and chain guide for the rear bike derailleur. With the motor unit for a bicycle derailleur according to the ninth aspect, it is possible to determine the position of the rear bicycle derailleur with respect to the plurality of rear sprockets after power interruption.

According to a tenth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to ninth aspects is configured such that the motor unit is provided in a base member of the bicycle derailleur. With the motor unit for a bicycle derailleur according to the tenth aspect, it is possible to protect the motor unit from damage while providing an aerodynamically and aesthetically pleasing bicycle derailleur.

According to an eleventh aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to tenth aspects is configured such that the bicycle derailleur includes a power interface configured to be connected to a battery, and The power interface is electrically connected to the motor. With the motor unit for a bicycle derailleur according to the eleventh aspect, the motor unit can be powered by a battery provided on the bicycle.

According to a twelfth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to eleventh aspects further includes a housing and a wireless communication unit. The motor, at least a portion of the output shaft and the intermediate gear structure are disposed in the housing of the motor unit. The wireless communication unit is configured to communicate with an additional wireless communication unit provided on the additional bicycle component. With the motor unit for a bicycle derailleur according to the twelfth aspect, the motor unit can be protected from damage, and wireless communication between the motor unit and additional bicycle components can be assisted.

According to a thirteenth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to twelfth aspects further includes a controller configured to calculate the output gear and Angle of one of the output shafts. With the motor unit for a bicycle derailleur according to the thirteenth aspect, the angle of the output gear or the output shaft can be determined from the value of the angle sensor.

According to a fourteenth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to thirteenth aspects is configured such that the angle sensor is a magnetic sensor. With the motor unit for a bicycle derailleur according to the fourteenth aspect, it is possible to determine the value of the angle sensor under extreme environmental conditions such as high temperature.

According to a fifteenth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to thirteenth aspects is configured such that the angle sensor is an optical sensor. With the motor unit for a bicycle derailleur according to the fifteenth aspect, it is possible to quickly and accurately determine the value of the angle sensor under conditions of ambient magnetic disturbance.

According to a sixteenth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to fifteenth aspects is configured such that the encoder rotates in response to rotation of a motor shaft of the motor. With the motor unit for a bicycle derailleur according to the sixteenth aspect, the position of the output gear can be controlled in accordance with the rotation of the motor shaft.

According to a seventeenth aspect of the present invention, the motor unit for a bicycle derailleur according to any one of the first to sixteenth aspects is configured such that the encoder is rotatably provided on the first shaft of the intermediate gear structure , the output gear is rotatably disposed on the second shaft, and the second shaft is adjacent to the first shaft without another shaft in between. With the motor unit for a bicycle derailleur according to the seventeenth aspect, the size of the motor unit can be minimized while maintaining the ability to accurately determine the position of the output shaft and/or the output gear.

This Summary is provided in a simplified form to introduce a selection of concepts that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure. As used herein, the term "small and/or light vehicle" means electric and non-electric vehicles, regardless of the number of wheels, but does not include four-wheel vehicles having an internal combustion engine as a source of power for driving the wheels, or requiring A license to drive a four-wheel electric vehicle on public roads.

Description of drawings

A fuller intent of the invention, together with its many attendant advantages, will be readily obtained, and better understood, by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which:

1 is a right side elevational view of an example bicycle incorporating a motor unit for a bicycle derailleur according to the present invention;

Fig. 2 is the outline sketch map of bicycle;

3A is a side view of a rear bicycle derailleur guiding a chain engaged with a bicycle sprocket according to the present invention;

Figure 3B is a diagrammatic illustration of a front bicycle derailleur according to the present invention;

4 is an exploded view of a motor unit for a bicycle derailleur according to the present invention;

5 is a side view of a gear structure in a motor unit for a bicycle derailleur according to the present invention;

6 is a top view of a gear structure in a motor unit for a bicycle derailleur according to the present invention;

7A-7C are diagrammatic illustrations of gear structures in a motor unit for a bicycle derailleur according to the present invention; and

8 is a schematic block diagram of a motor unit for a bicycle derailleur according to the present invention.

Explanation of reference signs:

1 bike

2 frame

3 rear wheels

4 front forks

5 front wheels

6 pedals

7 crank arm

8 crankshaft

9 bicycle chain

10 bicycle derailleur

10A rear bicycle derailleur

10B front bicycle derailleur

12 bicycle sprockets

12A rear sprocket

12B Front sprocket

14 Motor unit

16A base member

16B Base member

18A movable member

20A linkage

20B linkage

22A chain guide

22B chain guide

24 output shaft

26 motor

28 drive gear

30 output gear

32 Intermediate gear structure

34 angle sensor

36 motor shaft

38 reduction gear

38A First reduction gear

38B Second reduction gear

40 encoders

42 first axis

44 Second axis

46 Upper gear shaft support member

48 Lower gear shaft support member

50 shell

52 Rotation Limiting Structure

56 power connector

58 batteries

60 controllers

62 wireless communication unit

64 additional wireless communication unit

66 additional bicycle parts

68 switches

130 non-circular output gear

230 sector gear

P1 axial center plane

Detailed ways

Certain embodiments will now be explained with reference to the drawings, wherein like reference numerals designate corresponding or identical elements throughout the several drawings. It will be apparent to those skilled in the art from the present disclosure that the description of the following embodiments is provided for illustration only and not for the purpose of limiting the present invention.

Referring first to FIG. 1 , there is shown an exemplary bicycle 1 having a bicycle derailleur 10 having a motor unit 14 in accordance with at least one disclosed embodiment of the present invention. The bicycle 1 is, for example, an off-road bicycle such as a dirt bike or a mountain bike. Alternatively, bicycle 1 may be a road bicycle. As shown in the schematic outline of FIG. 2 , the bicycle 1 may have an axial center plane P1 defining left and right halves of the bicycle 1 . The following directional terms "forward", "rear", "forward", "backward", "left", "right", "lateral", "upward" and "downward", as well as any other similar directional terms, refer to Those directions determined while sitting on the saddle of bicycle 1 while facing the handlebars.

With continued reference to FIG. 1 , a bicycle 1 includes a frame 2 attached to a rear wheel 3 . The front fork 4 attaches the front wheel 5 to the frame 2 . The pedals 6 on both sides of the bicycle 1 are attached to corresponding crank arms 7 . Crank arms 7 are mounted on both sides of the frame 2 at an angle of 180 degrees to each other and are connected by a crank shaft 8 (indicated by dashed lines). The bicycle 1 of the present embodiment is driven by a chain drive transmission system including a bicycle chain 9 , a bicycle derailleur 10 and a bicycle sprocket 12 . It will be appreciated that the bicycle derailleur 10 described herein may be configured as either or both a rear bicycle derailleur 10A and a front bicycle derailleur 10B. Similarly, the bicycle sprocket 12 described herein may refer to one of the plurality of rear sprockets 12A and/or one of the plurality of front sprockets 12B.

The bicycle chain 9 is engaged with one of the plurality of front sprockets 12B and one of the plurality of rear sprockets 12A in an engaged state, as described below with reference to FIGS. 4 and 5 . The driving force applied to the pedal 6 rotates the crankshaft 8 and the front sprocket 12B. As the front sprocket 12B rotates, the bicycle chain 9 is driven around the rear sprocket 12A, which transmits power to the rear wheel 3 to propel the bicycle 1 . Thus, the front bicycle derailleur 10B shifts the bicycle chain 9 between the front sprockets 12B, and the rear bicycle derailleur 10A shifts the bicycle chain 9 between the rear sprockets 12A. As described in detail below, derailleurs by the rear bicycle derailleur 10A and/or the front bicycle derailleur 10B may be facilitated by the motor unit 14 included in either or both of the rear bicycle derailleur 10A and the front bicycle derailleur 10B. Shifting of the bicycle chain by the chain link 10B. Shifting of the bicycle chain 9 changes the gear ratio of the chain drive transmission to increase or decrease the distance traveled per rotation of the pedals 6 . The other parts of the bicycle 1 are known and will not be described here.

FIG. 3A shows a side view of a rear bicycle derailleur 10A according to the present invention. The rear bicycle derailleur 10A includes a base member 16A, a movable member 18A, a linkage mechanism 20A, and a chain guide 22A. In the configuration described in detail below, the motor unit 14 is disposed within the base member 16 of the bicycle derailleur 10, but the motor unit 14 may alternatively be configured to be disposed within other components of the derailleur. The motor unit 14 may be provided at one of the movable member 18A and the link mechanism 20A. FIG. 3B shows a schematic view of the front bicycle derailleur 10B. The bicycle derailleur 10 may be a front bicycle derailleur 10B including a base member 16B, a linkage mechanism 20B, and a chain guide 22B.

Referring to FIGS. 4 and 8 , the bicycle derailleur 10 includes a wireless communication unit 62 configured to communicate with an additional wireless communication unit 64 provided on an additional bicycle component 66 . The motor unit 14 may include a wireless communication unit 62 , but the wireless communication unit 62 may alternatively be provided within other components of the bicycle derailleur 10 . In the embodiments described herein, it is understood that the wireless communication unit 62 may be included in any one of the bicycle rear derailleur 10A and the bicycle front derailleur 10B.

FIG. 4 is an exploded view of the motor unit 14 for the bicycle derailleur 10 according to the present invention. The motor unit 14 includes an output shaft 24 , a motor 26 , a drive gear 28 , an output gear 30 , an intermediate gear structure 32 and an angle sensor 34 . The motor 26 includes a motor shaft 36 on which the drive gear 28 is disposed. An output gear 30 is provided on the output shaft 24 . An intermediate gear arrangement 32 is located in the load path between the drive gear 28 and the output gear 30 . The intermediate gear arrangement 32 includes at least one reduction gear 38 and an encoder 40 . In the embodiment described herein, the intermediate gear arrangement 32 includes two reduction gears 38A, 38B and an encoder 40 . However, it is understood that the intermediate gear arrangement 32 may be configured to include one reduction gear, three reduction gears, or any other suitable number of reduction gears. In the embodiment shown, angle sensor 34 is designed as a magnetic sensor. It will be appreciated that the angle sensor may alternatively be configured as an optical sensor or any other suitable type of sensor.

Each gear in the intermediate gear arrangement 32 is rotatably disposed on a corresponding shaft. The encoder 40 is rotatably disposed on a first shaft 42 of the intermediate gear arrangement 32 and the output gear is rotatably disposed on a second shaft 44 . As with the motor unit 14 illustrated in Figures 4-6, the second shaft 44 is configured adjacent to the first shaft 42 without another shaft therebetween. However, it is understood that the first shaft 42 and the second shaft 44 may alternatively be configured to be separated by one or more gears and shafts of an intermediate gear arrangement. The shafts are supported by an upper gear shaft support member 46 and a lower gear shaft support member 48 . As shown in the exploded view of FIG. 4 , and with reference to FIG. 8 , the motor unit 14 further includes a housing 50 in which the motor 26 , at least a portion of the output shaft 24 and the intermediate gear structure 32 are disposed. The housing 50 includes a substrate. In the assembled state, the wireless communication unit 62 is provided in the substrate. The intermediate gear structure 32 is disposed on a first side of the housing 50 relative to the base, and the wireless communication unit 62 is disposed on a second side of the housing 50 relative to the base, the second side being opposite to the first side.

In the configuration of the motor unit 14 described herein, the rotatable range of the output gear 30 is limited by the rotation limiting structure 52 of the bicycle derailleur 10 . Angle sensor 34 is configured to detect rotation of encoder 40 at a ratio of rotation between encoder 40 and output gear 30 such that encoder 40 rotates less than 360 degrees. Equation 1 below shows the general formula for this configuration, where G is the gear, n is the gear number, R is the rotation ratio between the nth gear and the n'th gear, and θ _n is the Rotation angle.

Formula 1: θ _n ×R(G _n :G _n' ) = θ _n' <360°

Shown below are example equations for different positions of the encoder 40 relative to the output gear 30 . In the example formula shown herein, the output gear 30 is represented as G ₀ , and θ ₀ is the rotatable angle of the output gear 30 . In a preferred embodiment, the rotation ratio between the output gear 30 and the encoder 40 is in the range between 4.5 and 7. When the encoder 40 is a gear (G ₁ ) adjacent to the output gear 30 or provided on a gear (G ₁ ) adjacent to the output gear 30 , the formula is as shown in Formula 2 below.

Formula 2: θ ₀ ×R(G ₀ :G ₁ )=θ ₁ <360°

When the encoder 40 is a gear (G ₂ ) two gears away from the output gear 30 or provided on a gear (G ₂ ) two gears away from the output gear 30 , the formula is shown in Formula 3 below.

Formula 3: θ ₀ ×[R(G ₀ :G ₁ )×R(G ₁ :G ₂ )]＝θ ₂ ＜360°

When the encoder 40 is a gear ( G3 ) three gears away from the output gear 30 or is provided on a gear ( G3 ) three gears away from the output gear 30 , the formula is as shown in Formula 4 below.

Formula 4: θ ₀ ×[R(G ₀ :G ₁ )×R(G ₁ :G ₂ )×R(G ₂ :G ₃ )]＝θ ₃ ＜360°

When a portion of the main body of the bicycle derailleur 10 , such as the base member 16 or the movable member 18 , and the motor unit are connected to the linkage of the bicycle derailleur 10 , the limitation of the rotatable range may be mechanical. Alternatively, the limitation of the rotatable range of the output gear 30 may be electric when the output gear 30 contacts the housing 50 of the motor unit 14 .

As described below with reference to FIG. 8 , the motor unit 14 further includes a controller 60 configured to calculate an angle of one of the output gear 30 and the output shaft 24 from the detection value of the angle sensor 34 . Because the encoder is limited to less than 360° of rotation, even in the event of loss of data related to the position of the bicycle derailleur 10 (such as power outage, backlash, or jumping), the controller 60 can The rotational ratio between the output gears 30 determines the state of the bicycle derailleur 10 (eg, the relative positions of the base member and the movable member), thereby determining the gear ratio of the transmission system.

5 and 6 show a side view and a top view of the gear structure of the motor unit 14, respectively. A motor 26 including a motor shaft 36 drives a drive gear 28 . The drive gear 28 drives at least one reduction gear 38 which in turn drives an encoder 40 . Accordingly, the encoder 40 is configured to rotate in response to rotation of the motor shaft 36 of the motor 26 . The encoder 40 drives the output gear 30 which in turn drives the output shaft, and the rotational force of the output shaft is transmitted to the linkage of the bicycle derailleur 10 to move the derailleur 10 . The encoder 40 may have a reduction gear function such that the encoder 40 reduces the rotational speed transmitted from the reduction gear 38 .

Referring to FIG. 7A , there is shown a schematic diagram of a gear structure in the motor unit 14 of the bicycle derailleur 10 according to the present invention. As mentioned above, the motor 26 including the motor shaft 36 drives the drive gear 28 . In the gear arrangement shown in FIG. 7A, the drive gear 28 is a worm gear. Additionally or alternatively, the drive gear may be a circular gear, a non-circular gear, a sector gear, or any other suitable gear type. The angle sensor 34 is configured to detect rotation of an encoder 40 that drives the output gear 30 and the output shaft. In the embodiment shown in FIG. 7A, the output gear 30 is circular, however, it is understood that the output gear can alternatively be configured as a non-circular output gear 130 (as shown in FIG. 7B ), a sector gear 230 ( 7C) or any other suitable gear type.

Referring to FIG. 8 , there is shown a block diagram of a motor unit 14 for a bicycle derailleur 10 according to the present invention. To power the motor 26 , the bicycle derailleur 10 includes a power port 56 configured to connect to a battery 58 , and the power port 56 is electrically connected to the motor 26 . As mentioned above and schematically shown in FIG. 8 , the motor unit 14 further includes a controller 60 , and the controller 60 calculates the angle of the output gear 30 or the output shaft 24 according to the detection value of the angle sensor 34 provided on the encoder 40 . As described above with reference to FIG. 3B , the wireless communication unit 62 is configured to communicate with the add-on wireless communication unit 64 provided on the add-on bicycle component 66 . Additional bicycle components 66 may be, for example, additional controls and may communicate with one or more switches 68 . Although FIG. 8 depicts the additional bicycle component 66 as being powered by the same battery 58 that powers the motor unit 14, it is understood that in another configuration, the additional bicycle component 66 may be powered by a separate battery. One or more switches 68 are configured to receive shift commands from the rider to initiate a shift operation. Thus, one or more switches 68 may be configured as shifters mounted on the handlebar of bicycle 1 . Although it has been described above that the add-on bicycle component 66 can be an add-on controller, it is understood that the add-on wireless communication unit 64 can be provided on any suitable add-on bicycle component.

While only selected embodiments have been chosen to illustrate the present invention, from this disclosure it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the scope of the invention. . For example, the size, shape, location or orientation of the various components may be changed as needed and/or desired. Components that are shown directly connected or contacting each other can have intermediate structures disposed between them. The functions of one element may be performed by two, and vice versa. The structures and functions of one embodiment can be adopted in another embodiment. Not all advantages necessarily occur in a particular implementation at the same time. Each feature which differs from the prior art, alone or in combination with other features, shall also be considered as a separate description of further inventions by the applicant, including the structural and/or functional concepts embodied by these features. Therefore, the foregoing description of the embodiments according to the present invention is provided for illustration only and not for the purpose of limiting the present invention.

Claims (16)

1. A motor unit (14) for a bicycle derailleur (10), comprising:

an output shaft (24);

-a motor (26), the motor (26) comprising a motor shaft (36);

-a drive gear (28), said drive gear (28) being on the motor shaft (36) of the motor (26);

an output gear (30), the output gear (30) being on the output shaft (24);

an intermediate gear structure (32), said intermediate gear structure (32) being located in a load path between said drive gear (28) and said output gear (30), and said intermediate gear structure (32) comprising at least one reduction gear (38) and one encoder (40); and

an angle sensor (34), the angle sensor (34) being configured to detect a rotation of the encoder (40), wherein

-a rotation ratio between the encoder (40) and the output gear (30) is such that the encoder (40) rotates less than 360 degrees; wherein the method comprises the steps of

The encoder (40) is rotatably arranged on a first shaft (42) of the intermediate gear structure (32);

the output gear (30) is rotatably arranged on a second shaft (44); and is also provided with

The second shaft (44) is adjacent to the first shaft (42) with no other shaft therebetween.

2. The motor unit (14) for a bicycle derailleur (10) according to claim 1, wherein the rotatable range of the output gear (30) is limited by a rotation limiting structure (52) of the bicycle derailleur (10).

3. The motor unit (14) for a bicycle derailleur (10) according to claim 2, wherein the limitation of the rotatable range is mechanical in the configuration of the main body of the bicycle derailleur (10) and the linkage of the motor unit (14) to the bicycle derailleur (10).

4. The motor unit (14) for a bicycle derailleur (10) according to claim 2, wherein in a configuration in which the output gear (30) contacts a housing (50) of the motor unit (14), the limitation of the rotatable range of the output gear (30) is electrical.

5. The motor unit (14) for a bicycle derailleur (10) according to any one of claims 1-4, wherein the output gear (30) is non-circular.

6. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the output gear (30) is a sector gear.

7. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the rotational force of the output shaft (24) is transmitted to a linkage of the bicycle derailleur (10).

8. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the bicycle derailleur (10) is a front bicycle derailleur (10B) that includes a base member (16B), a linkage mechanism (20B) and a chain guide (22B).

9. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the bicycle derailleur (10) is a rear bicycle derailleur (10A) that includes a base member (16A), a movable member (18A), a linkage mechanism (20A) and a chain guide (22A).

10. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the motor unit (14) is disposed within a base member (16 a,16 b) of the bicycle derailleur (10).

11. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the bicycle derailleur (10) includes a power interface (56) configured to be connected to a battery (58), and the power interface (56) is electrically connected to the motor (26).

12. The motor unit (14) for a bicycle derailleur (10) according to claim 5, further comprising:

-a housing (50), said motor (26), at least a portion of said output shaft (24) and said intermediate gear structure (32) being arranged in said housing (50); and

a wireless communication unit (62), the wireless communication unit (62) being configured to communicate with an additional wireless communication unit (64) provided on an additional bicycle component (66).

13. The motor unit (14) for a bicycle derailleur (10) according to claim 5, further comprising:

-a controller (60), the controller (60) being configured to calculate an angle of one of the output gear (30) and the output shaft (24) from a detection value of the angle sensor (34).

14. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the angle sensor (34) is a magnetic sensor.

15. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the angle sensor (34) is an optical sensor.

16. The motor unit (14) for a bicycle derailleur (10) according to claim 5, wherein the encoder (40) is configured to rotate in response to rotation of the motor shaft (36) of the motor (26).